EP3357324A1 - Machine agricole - Google Patents

Machine agricole Download PDF

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Publication number
EP3357324A1
EP3357324A1 EP18152967.8A EP18152967A EP3357324A1 EP 3357324 A1 EP3357324 A1 EP 3357324A1 EP 18152967 A EP18152967 A EP 18152967A EP 3357324 A1 EP3357324 A1 EP 3357324A1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
agricultural machine
operating unit
liner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18152967.8A
Other languages
German (de)
English (en)
Other versions
EP3357324B1 (fr
Inventor
Raffaele Ubaldi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ROC Group SRL
Original Assignee
ROC SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ROC SRL filed Critical ROC SRL
Priority to SI201830219T priority Critical patent/SI3357324T1/sl
Priority to PL18152967T priority patent/PL3357324T3/pl
Publication of EP3357324A1 publication Critical patent/EP3357324A1/fr
Application granted granted Critical
Publication of EP3357324B1 publication Critical patent/EP3357324B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D67/00—Undercarriages or frames specially adapted for harvesters or mowers; Mechanisms for adjusting the frame; Platforms
    • A01D67/005—Arrangements of coupling devices
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
    • A01B63/14—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements drawn by animals or tractors
    • A01B63/16—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements drawn by animals or tractors with wheels adjustable relatively to the frame
    • A01B63/22—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements drawn by animals or tractors with wheels adjustable relatively to the frame operated by hydraulic or pneumatic means
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/02—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having reciprocating cutters
    • A01D34/24—Lifting devices for the cutter-bar
    • A01D34/246—Hydraulic lifting devices
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D57/00—Delivering mechanisms for harvesters or mowers
    • A01D57/20—Delivering mechanisms for harvesters or mowers with conveyor belts
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D78/00—Haymakers with tines moving with respect to the machine
    • A01D78/08—Haymakers with tines moving with respect to the machine with tine-carrying rotary heads or wheels
    • A01D78/10—Haymakers with tines moving with respect to the machine with tine-carrying rotary heads or wheels the tines rotating about a substantially vertical axis
    • A01D78/1007—Arrangements to facilitate transportation specially adapted therefor
    • A01D78/1014—Folding frames
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D89/00—Pick-ups for loaders, chaff-cutters, balers, field-threshers, or the like, i.e. attachments for picking-up hay or the like field crops
    • A01D89/004—Mountings, e.g. height adjustment, wheels, lifting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/016—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
    • B60G17/0165—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input to an external condition, e.g. rough road surface, side wind
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G3/00—Resilient suspensions for a single wheel
    • B60G3/02—Resilient suspensions for a single wheel with a single pivoted arm
    • B60G3/12—Resilient suspensions for a single wheel with a single pivoted arm the arm being essentially parallel to the longitudinal axis of the vehicle
    • B60G3/14—Resilient suspensions for a single wheel with a single pivoted arm the arm being essentially parallel to the longitudinal axis of the vehicle the arm being rigid
    • B60G3/145—Resilient suspensions for a single wheel with a single pivoted arm the arm being essentially parallel to the longitudinal axis of the vehicle the arm being rigid the arm forming the axle housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D84/00—Haymakers not provided for in a single one of groups A01D76/00 - A01D82/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/10—Independent suspensions
    • B60G2200/13—Independent suspensions with longitudinal arms only
    • B60G2200/132—Independent suspensions with longitudinal arms only with a single trailing arm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/40—Type of actuator
    • B60G2202/41—Fluid actuator
    • B60G2202/413—Hydraulic actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/08—Agricultural vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/08—Agricultural vehicles
    • B60G2300/083—Boom carrying vehicles, e.g. for crop spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons

Definitions

  • the present invention relates to an agricultural machine, in particular a lifting and lightening system for an operating unit of an agricultural machine.
  • the present invention has its main application in the agricultural sector, preferably in equipment provided with a device for collecting agricultural products having a long-line form (such as grass, straw, legumes, biomass products and the like), which mostly need to "follow" the contour of the ground for optimal collection of the products.
  • a device for collecting agricultural products having a long-line form such as grass, straw, legumes, biomass products and the like
  • swather or windrower
  • a device provided with a collection or pick-up assembly extending transversely to the direction of advancement of the machine (a traction or self-propelled unit), and a discharge system, with a belt or screw conveyor, configured to convey the collected products to the sides or the rear of the machine.
  • These devices are usually provided with a frame connected to a traction unit and equipped with wheels/crawler tracks, on which the operating units or pick-ups are mounted, which in turn are equipped with small rolling wheels or slides that are required for adaptation to the ground during operation.
  • the prior art provides for the use of a pair of single- or double-acting hydraulic cylinders operatively interposed between the frame and the two support wheels of the machine, ensuring through these cylinders that the frame (and therefore the pick-up(s)) is at a predetermined height with respect to the ground.
  • the pick-ups are in turn connected to the frame by means of suitable hydraulic implementations, wherein the pick-ups are enabled to follow the ground through the use of accumulators and by appropriately adjusting the working pressure of the cylinders.
  • a further known solution instead, involves the coupling of the lifting cylinder and the "suspension" cylinder, thus uniting their rods.
  • a single rod is slidably associated at both its ends with a first liner and a second liner.
  • the object of the present invention is to provide an agricultural machine capable of obviating the above-mentioned drawbacks of the prior art.
  • the object of the present invention is to provide an agricultural machine that allows maximum versatility of use and reduced overall dimensions.
  • the object of the present invention is to provide a better-performing agricultural machine.
  • the machine comprises a frame and at least one operating unit (preferably provided with a collecting member) connected to the frame.
  • Such a machine further comprises at least one wheel or crawler track rotatably attached to the frame to allow the movement of the machine on a supporting surface.
  • a lifting unit is also provided, which is operatively interposed between the frame and the wheel (or between the frame and the operating unit).
  • This lifting unit is configured to vary the height of the operating unit with respect to the supporting surface of the machine.
  • the lifting unit is configured to vary the height (understood as the distance from the supporting surface) of the operating unit with respect to the frame and/or to directly raise or lower the frame with respect to the wheel, and therefore with respect to the supporting surface (i.e. the ground).
  • the lifting unit comprises at least one hydraulic cylinder provided with a liner, a first and a second piston, both slidably housed inside the liner.
  • pistons are preferably arranged in series inside the liner to define at least a first and a second chamber inside the liner.
  • hydraulically isolated chambers have a variable volume depending on the positioning of the pistons inside the liner.
  • the pistons substantially share the same working stroke (net of the cylinder head(s)), each one being able to exploit it completely or partially according to the position of the other.
  • the first and the second piston are controllable independently of each other.
  • the second piston can be used to cause lifting, thus determine the position, of the operating unit with respect to the ground, which then abuts against the first piston, while the first piston can act as a suspension.
  • the first chamber is controlled by pressure while the second chamber is controlled by volume (or position of the piston).
  • the machine comprises a control circuit configured to control the pressure in the first chamber and the volume of the second chamber.
  • the operating unit has at least one (rolling) element resting on the ground.
  • the position of the second piston inside the liner is guaranteed, allowing the operator to have maximum certainty about the position of the operating unit and/or the frame during lifting.
  • pressure control in the first chamber allows the first piston to move therein as the force discharged by the wheel (or the operating unit) onto the ground varies.
  • Pressure control in the chamber in fact, aims at avoiding such an occurrence (whereby the wheels of the operating unit would risk sinking into the ground) by increasing the pressure in the chamber in order to redistribute the weight on the first piston, thus bringing back the balance of weights into the correct configuration.
  • Pressure control further allows the first piston to respond to the increase in pressure with a corresponding decrease in volume in the first chamber, thus restoring the reference pressure and again bringing back the balance of weights into the correct configuration.
  • the weight of the operating unit is partly discharged onto the ground by said supporting element (or wheel/slide); the first piston is thus controlled so that the first chamber is set at a pressure such as to support a share of said weight (preferably at least 60%) in order to decrease the weight supported by the supporting element of the operating unit.
  • the operating unit remains in constant contact with the ground, following its contour, and the first piston is moved accordingly so that the contact pressure of the (rolling) supporting element, or wheel, remains constant (and reduced).
  • the numeral 1 indicates an agricultural machine according to the present invention.
  • the agricultural machine 1 which is the object of the invention, is of the type provided with at least a frame 2, a wheel 3 (or crawler track) and an operating unit 4 configured to perform an operation with respect to a supporting surface "A", i.e. the ground.
  • the operations for which the present invention is particularly advantageous are the gathering of long line-shaped agricultural products (e.g. grass, straw, etc.) or the cutting thereof.
  • long line-shaped agricultural products e.g. grass, straw, etc.
  • the present invention has its main, but not exclusive, application in agricultural machines 1 such as swathers, pick-ups, mowers etc., namely machines configured to follow the contour of the ground and perform the tilling at a predetermined height with respect to the ground itself.
  • agricultural machines 1 such as swathers, pick-ups, mowers etc., namely machines configured to follow the contour of the ground and perform the tilling at a predetermined height with respect to the ground itself.
  • Such agricultural machines 1 can indiscriminately be towed machines, thus moved by a traction unit, or self-propelled machines.
  • the frame 2 which as said can be integrated into a self-propelled machine or connected to a traction unit, is configured to support the operating unit 4 (or operating units) and is provided with one or more wheels 3 (or crawler tracks) resting on the ground.
  • the frame 2 is located in a central area at the sides of which at least two operating units 4 extend away from each other.
  • At least two wheels 3 are arranged at a lower portion of the frame.
  • the wheels 3 define the primary contact element through which the machine 1 contacts the supporting surface "A".
  • each wheel is designed to support at least one of said operating units 4, thereby balancing the agricultural machine 1.
  • the frame 2 comprises a central body 2a (mechanically and hydraulically) connectable to the traction unit and two lower supporting arms 2b, each associated with at least one wheel 3 (or crawler track).
  • the operating unit 4 preferably extends transversely to the direction of movement of the traction unit (and preferably transversely to the frame) and comprises at least one operating unit 4a adapted to interact with the agricultural products (to be cut or gathered) lying on the ground.
  • the operating unit is a pick-up assembly 5.
  • Such a pick-up assembly 5 is provided with a plurality of longitudinal prongs 5a, which can rotate around an axis extending along the main direction of the unit so as to collect, like a rake, the agricultural products lying on the ground.
  • this pick-up assembly 5 comprises a discharge unit 5b arranged operatively downstream of the pick-up assembly 5a and configured to move the gathered products in a predetermined direction in order to discharge the products at the sides or at the back of the operating unit 4.
  • the discharge unit 5b can be defined by a belt or screw conveyor.
  • this unit is provided with at least one supporting element 4b.
  • the supporting element 4b is of the rolling type, i.e. a small wheel, more preferably smaller than the wheels 3.
  • this supporting element 4b is a slide or the like.
  • the operating units 4 are at least two, connected to the frame 2 and movable towards and away from each other to define a plurality of operating configurations.
  • the agricultural machine 1 also comprises a lifting unit 6 operatively interposed between the frame 2 and the wheel 3, or between the frame 2 and the operating unit 4.
  • This lifting unit 6 is thus associated with the frame 2 and configured to vary the relative height between the frame 2 itself and the wheel 3 and/or the operating unit 4.
  • the lifting unit 6 is configured to vary the height of the operating unit 4 with respect to the supporting surface A of the machine 1, by lifting the frame 2 or directly lifting the operating unit 4.
  • the lifting unit 6 comprises at least one hydraulic cylinder 7.
  • the lifting unit 6 comprises at least one hydraulic cylinder 7 associated with each wheel 3 or operating unit 4.
  • the lifting unit 6 comprises two hydraulic cylinders 7 operatively (and physically) interposed between the frame 2 (in particular a support arm 2b) and a respective wheel 3.
  • the wheels 3 are connected to the frame, yet allowing relative movement so as to allow the previously described variation in height.
  • each wheel 3 is pivoted to the frame 2 at one arm 3a, so that the rotation of the arm 3a corresponds to one translation of the wheel 3.
  • the hydraulic cylinder 7 comprises a tubular liner 8 (or pipe) inside which a first 9 and a second piston 10 slide.
  • the first 9 and the second piston 10 are therefore slidingly housed inside the liner 8 and arranged in series to define, inside the liner itself, at least a first "C1" and a second chamber "C2".
  • the second chamber “C2" is preferably delimited, as well as by the side walls of the liner 8, by the second piston 10 and by a back wall of the liner 8.
  • the first chamber "C1" is at least partly delimited, as well as by the sidewalls of the liner 8, between the first 9 and the second piston 10.
  • the second piston 10 is of the double-acting type.
  • the second piston 10 is a slider 10a, which hydraulically divides the first "C1" and the second chamber “C2" of the liner 8.
  • the first piston 9, instead, may be of the single- or double-acting type.
  • such a piston is of the single-acting type, preferably of the plunger type.
  • the liner 8 is solely divided into the first and the second chamber.
  • the liner 8 also has a third chamber (not shown) which, in case the first piston is of the single-acting type, is not controlled, whereas when said first piston is of the double-acting type, can be controlled, thus providing additional functionality to the hydraulic cylinder 7.
  • the first piston 9 preferably comprises a rod 9a projecting outwards from the liner 8 and connected, at a free end thereof, to the wheel 3, the frame 2 or the operating unit 4.
  • the rod 9a of the first piston 9 is connected to the wheel 3, while the liner 8 of the hydraulic cylinder 7 is connected to the frame 2.
  • the cylinder may be interposed between the frame 2 and the operating unit 4, either under thrust (when the rod 9a is connected to the unit 4) or under traction (when the rod 9a is connected to the frame 2).
  • first 8 and the second piston 9 are controllable independently of each other.
  • the second piston 10 is movable inside the liner 8 so as to vary the volumetric ratio between the first "C1" and the second chamber "C2", thus determining the working stroke of the first piston 9 in the liner 8.
  • first 9 and the second piston 10 since they are arranged "in series" inside the liner 8, actually share the overall working stroke, which can therefore be “modulated” and divided between the first and the second chamber according to the working requirements.
  • the cylinder 6 can be switched between a working configuration and a transport configuration.
  • first 9 and the second piston 10 are preferably spaced apart from one another inside the liner 8 so that between them there is a fluid bearing that allows the first piston 9 to oscillate inside the first chamber "C1".
  • the second piston 10 abuts against the first piston 9 so as to prevent any oscillation thereof.
  • the second piston 10 is controlled so that it occupies the whole working stroke of the cylinder 7, by abutting against the first piston 9 and pushing it until the volume of the first chamber "C1" is reduced to a minimum.
  • This condition is considered a transport limit condition, in which the second piston 2 holds the rod 9a of the first piston 9 completely extracted, by pressing on it and preventing its oscillatory movement like a suspension.
  • the second piston 10 is movable inside the liner 8 between a first limit position, in which the second chamber "C2" has a volume that is substantially zero and the first piston 9 has a maximum working stroke inside the first chamber “C1" ( Figs. 2 , 3 and 5 ), and a second limit position, in which the volume of the first chamber “C1” is reduced to a minimum and the stroke of the first piston 9 is substantially zero ( Figs. 4 and 8 ).
  • the first chamber “C1" is controlled by pressure, whereas the second chamber “C2" is controlled by volume.
  • the machine comprises a control circuit 11 configured to control the pressure in the first chamber "C1" and the volume of the second chamber "C2".
  • the first chamber “C1" (and therefore the first piston 9) acts as a suspension capable of lightening the weight discharged by the operating unit 4 onto the supporting surface "A" through the supporting element 4b, whereas the second chamber “C2" determines the positioning height of the operating unit 4.
  • control circuit 11 comprises at least a first control element 12 for the first chamber "C1", which can be switched between an active configuration, in which it maintains the pressure inside the first chamber around a predetermined value, and a passive condition, in which the first chamber is substantially unloaded.
  • this control element 12 is a pressure stabilising valve or pressure stabiliser 12a, positioned at the port through which the fluid enters the first chamber "C1", so as to control the inlet or outlet flow.
  • the first control element 12 When the first control element 12 is in the active configuration, it allows the fluid to enter the chamber when the pressure therein falls below the predetermined value, whereas it allows the fluid to exit therefrom when the pressure therein rises above the predetermined value.
  • said "predetermined value" corresponds to the pressure required to support a share of the weight of the operating unit 4.
  • this share is comprised between 50% and 90% of the weight of the operating unit 4. Even more preferably, this share is comprised between 70% and 80% of the weight of the operating unit 4.
  • the first piston 9, and therefore the wheel 3 carries most of the weight of the operating unit, leaving the supporting element 4b (small wheel or slide) the task of discharging onto the ground (i.e. onto the supporting surface A) only a small fraction of the weight.
  • the supporting element 4b is able to follow the contour of the ground without sinking into it due to the excess weight (generally having to reduce its size).
  • a variation in the conformation of the supporting surface "A", i.e. the ground, corresponds to a variation in the weight discharged onto it by the supporting element 4b, which increases in the case of a bump and decreases in the case of a depression.
  • the aforesaid variation directly affects the cylinder 7, and in particular the first piston 9, which therefore increases or decreases the pressure in the first chamber "C1" in a way that is proportional to the variation.
  • the control element 12 is thus configured to restore the reference pressure inside the first chamber "C1" by re-balancing the contact forces of the wheel 3 and the supporting element 4b on the ground, thereby allowing correct functionality of the operating unit.
  • control circuit 11 comprises a second control element 13 for the second chamber "C2", which is configured to carry out a volumetric control of the chamber in order to control the position of the second piston 10 regardless of the pressure inside said second chamber "C2".
  • the second control element 13 for the second chamber “C2” can be switched between an active configuration, in which it controls the second piston 10 by moving it towards or holding it in a predefined position, and a passive condition, in which the second chamber "C2" is substantially unloaded.
  • controlling the second chamber "C2" by volume means that the position of the second piston 10 cannot vary with the variation of the pressure in the first chamber "C1", thus allowing the first control element 12 to manage the stroke of the first piston 9 in a completely independent way (unless there are interference issues and mechanical contacts).
  • the working pressure in the second chamber "C2" is greater than that in the first chamber "C1", and in particular is greater than the above-mentioned "predetermined value" of pressure.
  • the second control element 13 preferably comprises a distribution valve, which, when the second piston 10 reaches the predetermined position, is brought into the closed position, thus preventing the flow of fluid from or into the second chamber "C2".
  • each chamber (first "C1" and second “C2") is placed in fluid connection with a respective hydraulic circuit.
  • control circuit 11 comprises at least a first hydraulic circuit 14 connected to the first chamber "C1", and a second hydraulic circuit 15 connected to the second chamber "C2", which can be controlled independently of each other.
  • the second hydraulic circuit 15 has a working pressure greater than that of the first hydraulic circuit.
  • the second hydraulic circuit 15 has a working pressure such as to carry the weight of the operating unit 4, whereas the first hydraulic circuit 14 has a lower working pressure, such as to carry a fraction of said weight, in order to reduce the weight discharged by the operating unit 4 onto the ground during operation.
  • control circuit 11 comprises at least three hydraulic circuits, the first one 14 associated with the first chambers "C1" and two second ones 15 associated with the second chambers "C2".
  • the control of the first single-circuit chambers "C1" is enabled thanks to pressure control, which entails setting the same analogous reference pressure for both the first chambers "C1", which then respond independently to stresses from the ground.
  • the first hydraulic circuits may also be two.
  • the first hydraulic circuit(s) 14 is/are totally located on the machine 1.
  • the first hydraulic circuit 14 comprises a tank 14a, a pump 14b, piping and valves, all located on the agricultural machine 1.
  • the second hydraulic circuit(s), instead, is/are preferably placed in fluid (i.e. hydraulic) connection with the hydraulic circuit of the traction unit.
  • At least the tank and the pump of the circuit are located on the traction unit, connected to the second circuit(s) 15 by means of suitable pipes and joints.
  • the invention achieves the intended objects and attains important advantages.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Zoology (AREA)
  • Soil Sciences (AREA)
  • Vehicle Body Suspensions (AREA)
  • Centrifugal Separators (AREA)
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EP18152967.8A 2017-02-01 2018-01-23 Machine agricole Active EP3357324B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI201830219T SI3357324T1 (sl) 2017-02-01 2018-01-23 Kmetijski stroj
PL18152967T PL3357324T3 (pl) 2017-02-01 2018-01-23 Maszyna rolnicza

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000010720A IT201700010720A1 (it) 2017-02-01 2017-02-01 Macchina agricola

Publications (2)

Publication Number Publication Date
EP3357324A1 true EP3357324A1 (fr) 2018-08-08
EP3357324B1 EP3357324B1 (fr) 2020-12-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18152967.8A Active EP3357324B1 (fr) 2017-02-01 2018-01-23 Machine agricole

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US (1) US10827678B2 (fr)
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Cited By (3)

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IT201900013002A1 (it) 2019-07-26 2021-01-26 Roc Group S R L Macchina agricola
EP4140271A1 (fr) * 2021-08-26 2023-03-01 Pöttinger Landtechnik GmbH Machine agricole de traitement du sol pourvue de châssis de transport
EP4544897A1 (fr) * 2023-10-24 2025-04-30 CNH Industrial America LLC Système de réglage de position d'outil de récolte d'une moissonneuse agricole

Families Citing this family (2)

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CN109392417B (zh) * 2018-11-20 2022-01-18 山东正工机械有限公司 一种智能自动化割草机
US12490676B2 (en) * 2021-12-23 2025-12-09 Cnh Industrial America Llc Locking mechanism for the suspension assembly of a harvester and agricultural harvester

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EP2789223A1 (fr) * 2013-04-08 2014-10-15 I.G. S.R.L. Ensemble pour le déplacement et le transport de produits agricoles

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FR2733873B1 (fr) * 1995-05-10 1997-08-01 Kuhn Sa Faucheuse avec un dispositif d'allegement du mecanisme de recolte reglable a distance
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DE102011121777B4 (de) * 2011-12-21 2018-11-08 Ewo Fluid Power Gmbh Doppeltwirkender Hydraulikzylinder mit integrierten Kolbenspeichern
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US4622884A (en) * 1981-04-10 1986-11-18 Buchl Andrew F Floating piston depth control apparatus
EP0495210A1 (fr) * 1990-12-21 1992-07-22 Deere & Company Dispositif de relevage hydraulique à transfert de charge
US6318477B1 (en) * 2000-02-09 2001-11-20 Case Corporation Toolbar wing lift control
US20040200203A1 (en) * 2003-03-31 2004-10-14 Oxbo International Corporation Windrow merging apparatus
DE102004025522A1 (de) * 2004-05-25 2005-12-15 Amazonen-Werke H. Dreyer Gmbh & Co. Kg Hydraulische Betätigungsvorrichtung für eine landwirtschaftliche Bearbeitungsmaschine
EP1800529A1 (fr) * 2005-12-23 2007-06-27 Claas Saulgau Gmbh Faucheuse
DE102007020744A1 (de) * 2007-02-12 2008-08-14 Amazonen-Werke H. Dreyer Gmbh & Co. Kg Hydraulikzylinder
WO2010002339A1 (fr) * 2008-07-01 2010-01-07 Komatsu Forest Ab Suspension d'une roue de mesure à l'aide d'un vérin hydraulique à double action et absorbant les chocs
EP2789223A1 (fr) * 2013-04-08 2014-10-15 I.G. S.R.L. Ensemble pour le déplacement et le transport de produits agricoles

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900013002A1 (it) 2019-07-26 2021-01-26 Roc Group S R L Macchina agricola
US12364203B2 (en) 2019-07-26 2025-07-22 Roc S.R.L. Agricultural harvesting machine
EP4140271A1 (fr) * 2021-08-26 2023-03-01 Pöttinger Landtechnik GmbH Machine agricole de traitement du sol pourvue de châssis de transport
EP4544897A1 (fr) * 2023-10-24 2025-04-30 CNH Industrial America LLC Système de réglage de position d'outil de récolte d'une moissonneuse agricole

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CA2993556A1 (fr) 2018-08-01
PL3357324T3 (pl) 2021-05-31
EP3357324B1 (fr) 2020-12-30
US20180213723A1 (en) 2018-08-02
SI3357324T1 (sl) 2021-04-30
CA2993556C (fr) 2026-04-07
IT201700010720A1 (it) 2018-08-01
ES2857718T3 (es) 2021-09-29
US10827678B2 (en) 2020-11-10

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